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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Detail) (USD $) | Mar. 31, 2014
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Insurance [Abstract] |
Bank's reserve based on the analysis in the unfunded commitments | $ 12,000

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- Definition Banks reserve based on analysis in unfunded commitments. + References No definition available. + Details
Name: | pnbk_BanksReserveBasedOnAnalysisInUnfundedCommitments
Namespace Prefix: | pnbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration